Panasonic St-ch7l User manual

ORDER

NO.

AD9104083C8

Service

Manual

LW/MW/FM

Stereo

Tuner

Color

(K)

e250

inf

Black

Type

Areas

Country

Code

(E)

Continental

Europe.

Asia,

Latin

America,

Middle

Near

East

and

Africa.

Because

of

unique

interconnecting

cables,

when

a

component

requires

service,

send

or

bring

in

the

entire

system.

Oceania.

System:

SC-CH7

@

SPECIFICATIONS

(DIN

45

500)

Sensitivity

(S/N

20

dB)

MW

20

uV,

300

pV/m

m@

FM

TUNER

SECTION

LW

50

pV

Frequency

range

87.50~108.00

MHz

(0.05

MHz

step)

Selectivity

(+9

kHz)

Sensitivity

1.5

uV

(IHF,

usable)

MW

(at

999

kHz)

50

dB

S/N

30dB

1.5

wV

(75Q)

LW

(at

216

kHz)

50

dB

S/N

26

dB

1.3

pV

(75Q)

S/N

20dB

1.2

pV

(75Q)

m

TIMER

SECTION

IHF

46

dB

stereo

quieting

sensitivity

28

pV

(750)

Clock

Quariz-lock

type

Total

harmonic

distortion

24-hour

indication

MONO

0.2%

Functions

24-hour

programmable;

STEREO

0.3%

weekly

(1

time)

S/N

once

only

(1

time)

MONO

60

dB

(74

dB,

IHF)

sleep

(1~120

min.,

1-min.

intervals)

STEREO

58

dB

(70

dB,

IHF)

Setting

intervals

1

minute~23

hours,

59

minutes

Frequency

response

20

Hz~15

kHz,

+0.5

dB~—1.5

dB

(at

1

min.

intervals)

Alternate

channel

selectivity

+400

kHz

50

dB

Stereo

separation

1

kHz

40

dB

@

GENERAL

10

kHz

30

dB

Power

consumption

8W

Channel

balance

(250

Hz~6,300

Hz)

+1.5dB

Dimensions

(WxHxD)

215x55x295

mm

Limiting

point

1.2

UV

(815/s2"

x

252"

x

115%")

Bandwidth

Weight

1.4kg

(3.0

Ib.)

IF

amplifier

180

kHz

FM

demodulator

1000

kHz

Notes:

Antenna

terminal

75Q

(unbalanced)

1.

Total

harmonic

distortion

is

measured

by

the

digital

spectrum

analyzer.

@

LW/MW

TUNER

SECTION

2.

Specifications

are

subject

to

change

without

notice.

Frequency

range

3.

Weight

and

dimensions

shown

are

approximate.

MW

522~1611

kHz

(9

kHz-step)

530~

1620

kHz

(10

kHz-step)

LW

144~288

kHz

(9

kHz-step)

146~290

kHz

(+2

kHz-shift)

System

[Tuner

|

—sAmplifier_—_—|

CD

Player

Cassette

Deck

Speakers

SC-CH7

ST-CH7L

SU-CH7

SL-CH7

RS-CH7

SB-CH7

‘Technics

/Panasonic

(E)

(GC)

(GN)

ST-CH7L

m@

CONTENTS

Page

LOCATION

OF

CONTROLS

...........

0.00

0c

cece

e

eee

eens

2,3

DISASSEMBLY

INSTRUCTIONS

................000

000

eee

4

MEASUREMENTS

AND

ADJUSTMENTS

..................

5,6

DESCRIPTION

OF

FLPANEL

...............000cceeeeeees

7

FUNCTION

OF

IC

TERMINALS..............0.00.0

00.

ce

ees

8

SCHEMATIC

DIAGRAM

..............000

cc

ccc

eee

e

eee

9~12

Note:

Page

PRINTED

CIRCUIT

BOARDS

AND

WIRING

CONNECTION

DIAGRAM

(.,

55355

05te

chen

fon

oi

wate

Saitonae

nae

oe

13,

14

BLOCK

DIAGRAM

..........0..

00.

c

cece

eee

e

eee

15,

16

REPLACEMENT

PARTS

LIST

..................0.000,

17~21

CABINET

PARTS

LOCATIONS

............0

0000

cece

cee ues

21

Refer

to

the

service

manual

for

Model

No.

SU-CH7,

Order

No.

AD9104082C8

for

information

on

ACCESSORIES,

INSTALLATION

OF

THE

SYSTEM,

CONNECTIONS

and

PACKAGING.

m@

LOCATION

OF

CONTROLS

SENSOR

CANCEL

RECALL

CLOCK

SET

WSELECT

A

©

Oo

G

STEREO

SYNTHESIZER

TUNER

ST-CH7L

om

MWV

ALLOCATION

PT

LW

FREQ

sine

PRESET

Tuner:

control

section

@

Timer

set

button

(TIMER

SET)

This

button

is

used

when

making

the

timer

setting.

Timer

select

buttons

(WV

SELECT

A)

These

buttons

are

used

when

setting

the

time.

And

when

making

the

timer

setting,

to

select

the

type

of

timer

operation,

the

day,

the

time,

etc.

@®

Remote

signal

sensor

(SENSOR)

Band

select

button

(BAND)

This

button

is

used

to

select

either

the

MW,

LW

or

FM

band.

Preset-tuning

buttons

(V

PRESET

A)

These

buttons

are

used

to

select

channel

numbers

for

a

broadcasting

station

which

has

been

stored

in

the

tuner’s

memory.

®

©

Timer

cancel

button

(CANCEL)

This

button

is

used

to

cancel

the

timer

setting.

Power

“STANDBY

()/ON”

switch

(POWER

STANDBY

(!)

/ON)

This

switch

switches

ON

and

OFF the

secondary

circuit

power

only.

The

unit

is

in

the

“standby”

condition

when

this

switch

is

set

to

the

STANDBY

('

position.

Regardless

of

the

switch

setting,

the

primary

circuit

is

always

“live”

as

long

as

the

power

cord

is

connected

to

an

electrical

outlet.

@

©

Timer

setting

confirmation

button

(RECALL)

This

button

is

used

to

confirm

the

timer

setting.

Clock

set

button

(CLOCK

SET)

This

button

is

used

to

set

the

present

time.

Memory

button

(MEMORY)

This

button

is

used

when

presetting

broadcast

station

frequencies

into

memory.

Tuning

buttons

(V

TUNING

A)

These

buttons

are

used

for

tuning

the

desired

broadcast

Station.

@ ©

@

SENSOR

ST-CH7L

Tuner:

display

section

@

©

86

®

&®

@®

Timer

play/recording

indicator

(PLAY,

REC)

This

indicator

shows

that

timer

play

mode

or

timer

recording

mode

is

activated.

Timer

mode-indicator

(]

ONCE,

WEEKLY)

This

indicator

shows

the

timer

operation

mode

(ONCE

or

WEEKLY).

Day

display

(SUN—SAT)

This

display

shows

the

present

day,

or

the

day

the

timer

has

been

set

for,

if

used.

Sleep

indicator

(SLEEP)

llluminates

when

the

sleep

timer

is

activated.

Timer

ON/OFF

indicator

(ON,

OFF)

This

indicator

shows

whether

the

times

for

timer

switch-ON

and

switch-OFF

have

been

set.

Time

display

This

display

shows

the

present

time,

or

the

time

the

timer

has

been

set

for.

FM

stereo

indicator

(STEREO)

This

indicator

automatically

illuminates

when

an

FM

stereo

broadcast

is

being

received.

It

will

not

illuminate

if

the

FM

mode

button

is

used

to

select

monaural

mode.

®

O08

8

O

Band

indicator

(FM,

MW,

LW)

Illuminates

to

show

which

band

is

selected.

Digital

frequency

display

Displays

the

broadcast

frequencies.

Quartz

lock

indicator

(QUARTZ

LOCK)

This

indicator

illuminates

when

the

unit

is

precisely

tuned

to

a

broadcast

station.

Memory

indicator

(MEMO)

This

indicator

illuminates

when

the

memory

button

is

pressed.

Preset

channel

display

This

display

shows

the

channel

number

selected

by

the

preset-tuning

buttons.

FM

mode

indicator

(AUTO,

MONO)

When

FM

broadcasts

are

being

received,

usually

the

“AUTO”

indication

is

illuminated.

When

the

FM

mode

is

set

to

monaural,

“MONO”

illuminates.

ST-CH7L

m@

DISASSEMBLY

INSTRUCTIONS

“ATTENTION

SERVICER”’

Some

chassis

components

may

have

sharp

edges.

Be

careful

when

disassembling

and

servicing.

aa]

Removal

of

the

Cabinet

1

Remove

the

5

screws

(@~@).

Procedure

1523

Pee

||

Removal

of

the

Operation

P.C.B.

Front

Panel

Reinforce

plate

1.

Remove

the

2

screws

(@, @).

1.

Puilup

the

position

©

of

the

front

panel

in

the

direction

of

the

2.

Remove

the

front

panel

in

the

direction

of

arrow.

arrow

@,

and

then

remove

the

reinforce

plate

in

the

direction

of

the

arrow

©.

*Remove

the

8

screws

(@~@).

ST-CH7L

m

MEASUREMENTS

AND

ADJUSTMENTS

This

TUNER

(ST-CH7L)

is

powered

by

the

amplifier

(SU-CH7).

To

adjust

it

or

check

operations

as

a

separate

unit,

follow

the

steps

below.

1.

Apply

a

power

supply

voltage

of

AC

23

V

to

[yZe

and

iZey)-

2.

Power

supply

switch:

ON

HOW

TO

CONNECT

Note:

Apply

a

power

supply

voltage

of

AC

23

V

to

pieydehd

and

paeygeyy

by

using

a

Voltage

Controller.

If

itis

not

available,

use

a

Power

Supply

Fixture

(SZZA1058C)

Voltage

controller

Power

Supply

Fixture

(SZZA1058C)

OR

instead.

©

a

e

ADJUSTMENT

POINT

AM

LOOP

ANT

AM

ANT

FM

ANT

TO

AMP

750

7

Z202

LINE

OUT

LINE

OUT

(Leh)

(Reh)

FM

mono

distortion

FM

offset

PLL

clock

Frequency

FM

MPX

VCO

(I9kHz)

eFM

ADJUSTMENT

Control

positions

and

equipment

used

@FM

signal

generator

(FM-SG)

Frequency

counter

Choke

coil

(100

LH)

e

Resistor

(100

kQ)

Stereo

modulator

e

Distortion

analyser

DC

electronic

voltmeter

(EVM)

Note:

For

Z201

(AM

ANT

and

OSC

coil),

Z202

(AM-IFT),

they

are

supplied

as

adjusted

parts.

So,

do

not

turn

the

cores

of

the

parts.

If

is

not

necessary

to

adjust

the

AM

circuit.

FM

OFFSET

VOLTAGE

AND

MONO

DISTORTION

ADJUSTMENT

FM

SIGNAL

GENERATOR

CONDITION

Modulation

1.

Test

equipment

connection

is

shown

in

figure.

Modulation

frequency

.

Set

the

unit

to

“FM”

mode.

Output

level

.

Set

the

radio

frequency

display

and

signal

generator

to

100.10

MHz.

.

Adjust

the

core

of

T201

so

that

the

voltage

measured

in

signal

mode

is

0

mV

(0+20

mV)

in

300

mV

range.

.

Adjust

T202

so

that

the

distortion

factor

of

L-CH

and

R-CH

is

minimized.

.

Repeat

steps

4

and

5.

Note:

The

adjusting

screwdriver

used

should

be

made

of

resin.

FM

MPX

VCO

ADJUSTMENT

.

Test

equipment

connection

is

shown

in

figure.

.

Set

the

unit

to

“stereo”

position.

.

Set

the

radio

frequency

display

and

signal

generator

to

100.10

MHz.

.

Adjust

VR501

for

19

kKHz+30

Hz

on

frequency

counter

reading.

FM

ANT

(759)

USING

ALTERNATE

SYSTEM

1.

Receive

the

stereo

broadcast.

2.

Adjust

VR301

until

stereo

indicator

lights

up.

Fix

the

arm

of

VR301

as

shown

in

gifure.

“Stereo”

FM

SIGNAL

GENERATOR

CONDITION

Modulation

frequency

....

OkHz

Output

level

.

“Stereo”

OFF

position

.

“Stereo”

ON

position

(Indicator

lighting)

Adjust

point

of

pilot

circuit

PLL

CLOCK

FREQUENCY

ADJUSTMENT

Use

a

high

impedance

probe.

Frequency

counter

1.

Test

equipment

connection

is

shown

in

figure.

2.

Adjust

CT101

for

2070+0.010

kHz

(2050+0.010

kHz...GC

only)

on

frequency

counter

reading.

9

O00000

’

=

“requency

counter

*)

1

a

sis

circuit

requency

counter

(ar)

i

As

ST-CH7L

m@

DESCRIPTION

OF

FL

PANEL

[FL901

(RSLO096-F)]

eGRID

ASSIGNMENT

7G

SUN

MON

TUE

WED

THU

FRI

SAT

ONCE

WEEKLY

PLAY

REC

SLEEP

QUARTZ

LOCK

20

1

kHz

Memo

2alé

chsh

auto

cH.el_lé

el_le

@PIN

CONNECTION

3/3l2l2f2j/2t2;2l2j2i2l2ajiliaiaiatiasaia}ata}a

NO.

110/9/8/7/6/5/4/3/2/1]/o0/9/81/7/6/5/4/3/2]/1]ol9;8|7\/6/5/4/3]/2]1

FIF

P|P/P/P/PIP|P|Pj/P/P|PIP|P|P|P|P|P

N/FIE

CONNECTION

qiq}qtatadd

1IN/1/2/3/4/5/6/7

2/2

7/5/4/3/2]1lol9lslol1j2i3l4islel6élcialalalalaiala/pi1]41

Note:

1)

F1,F2..............

Filament

2)

INP

cricstsacicdta

Siateboestr

No

3)

1G~8G

............

Grid

@

ANODE

CONNECTION

AM

—

PM

2e

FM

2e

|

2e

WEEKLY

2c

_ _

2g

MW

29

ONCE

—

of

—

2t

2f

—_

2b

—

2b

+

=

i

a

2a,

2d, 2e,

2g

2a

STEREO

2a

PLAY

ON

col

$1

2h

2d

2a, 2d,

2e,

2g

AUTO

QUARTZ

LOCK

P8

WED

1d

P9

SAT

le

P10

in

TUE

1c

i

Pit

FRI

1g

P12

MON

zi

1f

P13

THU

1b

P14

SUN

la

Pts

nn

P16

-_

—

ST-CH7L

m

FUNCTIONS

OF

IC

TERMINALS

@|C901

(MN187125STT1)

——

He)

:

Vo

:

No.

Mark

Division

Function

No.

Mark

Division

Function

1

VDD

I

Power

supply

(+B)

22

SBT1

O

Clock

terminal

for

serial

data.

:

OSCE

Connected

to

crystal

oscillator

23

CE

ie)

aie

Hensiniesion

Operation

(X901)

(4.19

MHz)

ip

enable

terminal

3

Osc

O

:

24

SBO1

ie)

Serial

data

signal

output

Connected

to

ground

terminal

BoC

OUE

2

External

control

clock

signal

input-

output

Connected

to

ground

terminal

26

|

CLOCKIN

X0

Not

connected

DATA

OUT

External

control

data

signal

output

7

KEY2

I

Key

scan

signal

input

Not

connected

8

|

KEY1

BIN

I

Connect

to

ground

terminal

a

I

Connectd

to

ground

terminal

9

CR

|

Not

connected

-——————_-—-—

sch

OT

DATA

IN

|

External

control

data

signal

input

Stereo

input

10

STEREO

I

Inputs

when

stereo

signal

receipt

Input

for

stop

signal

during

auto

“L”,

monaural

signal

receipt

“‘H”’.

tuning.

—S

Stops

auto

tuning

at

high

level.

When

broadcasting

receipt

“L”,

Receipt:

H,

No

signal:

L

14

DIR

|

stereo/normal

broadcasting

receipt

“H”.

Output

for

erasing

shock

noise

Not

connected

when

lock-off

at

PLL.

bt}

<Muting

outut>

12

MONO

oO

Auto/mono

change

over

terminal.

1.

Power

switch

“off”.

2.

Frequency

change

13

MERO

O

Remote

control

signal

terminal.

(up/down,

FM<—>AM<—>

TV)

14

Not

connected

Put

out

“H”

when

those

of

above

two.

15

INT

|

Remote

control

input

16

peas

l

Power

supply

level

detection

Netcoanecied

oe

DTS

selective

output

terminal.

.

oO

Key

scan

signal

output

wt

Not

connected

BM

AC

output

Put

out

for

“H’”

when

moving.

For

Digit

signal

output

to

FL

display

cutting

relay

dirive

of

main

power

3

POWER

o

supply.

Becomes

“H”

when

PLL

is

moving.

Reverse

when

put

the

power

key.

20

TB

I

Band

data

input

Reset

signal

input

21

RESET

l

Input

of

reset

for

micro

computer

stand

Serial

data

signal

input

Segment

signal

output

to

FL

display

FL

motor

power

supply

|

SCH

EMATIC

DIAG

RAM

(Parts

list

on

pages

17~20.)

Notes:

eS901,902

:

Preset

channel

switch.

(S901:

Up,

S902:

Down)

eS903

:

Band

select

switch.

eS904

:

Memory

switch.

eS905,

906

:

Tuning

switch.

(S905:

Up,

S906:

Down)

eS907,908

:

Timer

select

Switch.

(S907:

Up,

S908:

Down)

eS909

:

Timer

set

switch.

@S910

:

Clock

set

switch.

eS9i1

:

Timer

setting

confirmatin

switch.

e$912

:

Timer

cancel

switch.

eS913

:

Power

switch.

indicated

voltage

values

are

the

standard

values

for

the

unit

measured

by

the

DC

electronic

circuit

tester

(high-impedance)

with

the

chassis

taken

as

standard.

Therefore,

there

may

exist

some

errors

in

the

voltage

values,

depending

on

the

internal

impedance

of

the

DC

circuit

tester.

(_

):

MW

voltage,

[

]:

LW

voltage,

]:

MUTING

voltage

eimportant

safety

notice

Components

identified

by

A.

mark

have

special

characteristics

important

for

safety.

When

replacing

any

of

these

components,

use

only

manufacturer's

specified

parts.

eThis

schematic

diagram

may

be

modified

at

any

time

with

the

development

of

new

technology.

ooo00f

FMOSC

muaep

AMOSC

«Caution!

a>

IC

and

LSI

are

sensitive

to

static

electricity.

Secondary

trouble

can

be

prevented

by

taking

care

during

repair.

AM

signal

AF

signal

lines

*Cover

the

parts

boxes

made

of

plastics

with

aluminum

coil.

*Ground

the

soldering

iron.

*Put

a

conductive

mat

on

the

work

table.

«Do

not

touch

the

legs

of

IC

or

LSI

with

the

fingers

directly.

Positive

voltage

lines

--=—=—

Negative

voltage

lines

c—>

FM

signal

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